Sony CDP-950
A workmanlike second-generation CD spinner whose spec sheet reads better than its price tag would suggest.
Period coverage of portable and compact CD players in the late 1980s stressed practical flexibility - line outputs that let a player move between systems and rooms, and compact footprints that fit crowded equipment shelves - as HiFI-Stereo (March 1988, p.82) noted.
Overview
The CDP-950 doesn't announce itself. It's a compact disc player, full stop - a 430 mm-wide slab of early-digital Sony, roughly 105 mm tall and 340 mm deep, at about 5.6 kg net. The interesting part is in the manual, not on the faceplate. Sony's service documentation lists a frequency response of 2 Hz to 20,000 Hz within ±0.3 dB, a signal-to-noise ratio above 104 dB, dynamic range above 95 dB, and harmonic distortion under 0.003% at 1 kHz. Channel separation is quoted at better than 95 dB at 1 kHz. Wow and flutter is listed as below measurable limit, which is the whole point for a CD player. These are not flagship numbers for the era, but they're not budget-bin numbers either.
The digital section is standard first-generation CD hardware. The laser is a 780 nm semiconductor type with continuous emission, output rated under 44.6 µW measured 200 mm from the objective lens. Track pitch is 1.6 µm, sampling frequency 44.1 kHz, quantization 16-bit linear per channel, and the transfer rate runs 2.03 Mbit/sec before modulation. The CDP-950 plays Red Book CDs the way the format was designed to be played, with no oversampling tricks or exotic filtering advertised in the surviving documentation.
The connection bay is where the CDP-950 earns its keep. There's a fixed line output at 2 V into 50 kilohms (load impedance over 10 kilohms), a variable line output that also tops out at 2 V but wants a load over 50 kilohms, and a headphone jack rated at a maximum of 15 mW into 32 ohms. The variable output is the useful one. It lets the player drive a power amp directly without a preamp in the chain. There's also a coaxial digital output on a phono jack, 0.5 Vp-p into 75 ohms, but the manual is specific: the coaxial digital out is fitted to the Canadian and AEP versions of the CDP-950, and to the CDP-307ESD. Check the badge on the back before assuming you have one.
The remote is the RM-D650, an infrared commander running on two AA batteries and weighing about 130 g loaded. The player ships with the remote, an audio signal cord, and a pair of Sony SUM-3 batteries. The remote measures roughly 62 x 20 x 168.5 mm, a long, thin wand of the type Sony was issuing across its line at the time.
The feature set leans on programmability. Owners can store up to 226 custom files, each keyed to a specific disc, and those files survive roughly a month without AC power. That's enough to get through a move or a vacation, but a player left unplugged in a closet will come back blank. Each disc can carry either a program bank or custom indexes, but not both at once. Programmed selections can be checked during playback by stepping through with the CHECK button, and the display shows "END" after the last entry. Selections past number 20 don't appear in the music calendar but do show their track and program numbers in the window. To clear, press once at stop or twice during play to wipe the whole program, use CLEAR at stop to remove the last entry, or step through with CHECK and clear individual selections. The track currently playing can't be removed.
Serviceability is a mixed bag. The service manual includes a full electrical adjustment section, PC board layouts, exploded views, and a parts list, which is more than many players of the era can claim. The RF PLL adjustment procedure calls for grounding TP(ASY), connecting a frequency counter to TP(PCK), and trimming RV201 to 4.3218 MHz ±30 kHz. It assumes a test disc (YEDS-18) and a scope, so it's not a kitchen-table job. There's a documented procedure for opening the disc tray when the power switch fails. The manual also warns that the laser diode is a GaAlAs type and that the optical pickup block should not be disassembled or its APC circuit adjusted. If the APC or diode fails, the whole pickup block gets replaced.
Power requirements vary by market: US and Canadian units take 120 V AC at 60 Hz, the AEP version takes 220 V AC at 50/60 Hz, and the E version is a multi-voltage unit covering 110, 120, 220, and 240 V AC. Power consumption is listed at 13 W across all versions.
What the CDP-950 is, in the end, is a competent mid-line Sony CD player from the early years of the format, documented well enough that a determined owner can keep one running. The specs are honest, the outputs are flexible, and the memory features are more thoughtful than the plain faceplate suggests. It won't be the centerpiece of a collection, but as a working second system player or a first CD machine for someone who wants to hear what the fuss was about without paying flagship money, it does the job. Buyers should verify which market version they're looking at — the digital output question alone is worth the phone call.
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